package cn.tedu.sp06.fb;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {

    /*
     * 设置对哪个服务应用当前的降级类
     * item-service：对商品服务降级
     * "*" :所有服务都应用当前降级类
     * null:所有服务都应用当前降级类
     * */
    @Override
    public String getRoute() {
        return  "item-service";
    }


    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {
                //用来关闭下面方法的输入流inputstream
                //
            }

            @Override
            public InputStream getBody() throws IOException {
                //JsonResult--{code:500,msg:调用后台服务出错，data:null}
                String json= JsonResult.build()
                        .code(500).msg("调用后台服务出错").toString();
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h=new HttpHeaders();
                h.add("Content-Type",
                        "application/json;charset=UTF-8");
                return h;
            }
        };
    }
}


